It is a good practice to use SaveProject step after each important step of your pipelines. This will ensure that if there is an error on a late step, at least the other steps completed and saved.

In Oscript for local project

Between each step, you can add this:

Begin SaveProject;
Project ProjectName;
File "/path-to-project/ProjectName.osprj";
End;

In Oscript for server project

Between each step, you can add this:

Begin SaveProject;
Project ProjectName;
End;

In Server Pipeline

Between each step, you can add this:

Begin SaveProject;
End;